Rendering machine



Sept. 18, 1934. c. OFFENHAUSER RENDERING MACHINE Filed Sept. 25, 1929 R m m m Jr. W

Patented Sept. 18, 1934 U EDTSTATE PATENT OFFICE One of the objects of this invention is to devise a novel rendering machine wherein a minimum amount of steam is employed for the rendering operation. It has heretofore been customary in devices of this character to employ a single steamjacket around the rendering tank through which steam circulates.-

In accordance with this invention I employ exterior of the inner steam-jacket an outer steamlC jacket which is in valve controlled communication with the rendering chamber of the rendering tank so that the steam and vapors in the rendering tank can be withdrawn through the outer steam-jacket.

A further object of the invention is to devise novel means for stirring and agitating the material being rendered in the form of a novel construction of helically arranged paddles with means for causing them to revolve in either a forward 23 or a reverse direction.

A further object of this invention is to devise a novel rendering machine wherein in the same machinethematerialcan be subjected to both heat and pressure so that a greater volume. of the cilis separated in the same machine.

A further object is todevise a novel rendering machine wherein the material is first subjectedto the action of heat while being fed in one direction and wherein when the material is fed in the 3,) oppositedirection it passes to a pressure extracting mechanism in the form of a compressor screw orworm. g

With thelabove and other objects in view, as will hereinafter more clearly appear, my inven- 2-5 tion comprehends a novel rendering machine.

It further comprehends a novel rendering machine having a plurality of steam-jackets surrounding the rendering tank with one of said steam-jackets in communication with the cham-- ber of the rendering tank.

chine wherein novel means are employed to agitate and break-up the material such means adapted to be driven in direction.

It further comprehends anovel rendering machine wherein novel means are employed to maintain the material at the proper temperature and w .tailed description and the appended claims.

. It further comprehends a novel rendering ma--.

either a forward or reverse For the purpose of illustrating the invention, I have shown in the accompanying drawing typ-; ical embodiments of it, which, in practice, will give reliable and satisfactory results. It is, however, to be understood that these embodiments are typical only and that the various instrumentalities of which my invention consists can be variously arranged and organized, and the invention isnot limited to the precise arrangement and organi-- zation ofthese instrumentalities as herein set forth. a t

Figure 1 is a side elevation partly diagrammatic of a rendering machine embodying my invention.

Figure 2 is a front elevation of one of the paddles. r Figure 3 is an end elevation of the paddleseen in Figure 2. f Y Figure 4 is aside elevation of anotherform of pressing mechanism embodying-the invention.

Similarnumerals of reference indicate corresponding parts. Referring to the drawing:- 3 The rendering machine is driven by means of a prime mover 1 which is preferably an electric motor. The shaft'of the motor is provided with a reversing mechanism 2 and forms an operative connection with the shaft 3 on which is mounted a pulley 4. around which passes a belt 5 which latter also passes around a pulley 6 on an agitator, shaft '7. This agitator shaft '7 .is suitably jour-i nalled in bearings 8 and passes through the cham-,. her 9 of a rendering-tank 10. The rendering tank 10 is provided with a controllable filling opening 11 through which the material, to be treated is. introduced into the chamber 9 of the renderingv tank. This opening 11 is providedwith. a closure 12 of any desired character. Y The agitator shaft 7 has mounted thereon the hubs l3 whichare provided with'the stems" 14jto. which are connected the plates 15 whichiarepref; erably=hardened steel, plates havingla-knife edge and removably connected to theouter 'endsor. heads of the stems l lby means of .fastenin'g'jde vices 16. f .i

The rendering tank 10 is surrounded by an inner steam-jacket 1'7 and by an outeri.steam-" jacket 18. A steam pipe 19 connected with. a source of steam supply leads to the inner steam--v jacket 17 and is provided witha controlling valve 20. A branch steam conduit 21 leads from the inlet steam line l9-and communicates with the. outer steam-jacket 18 which is, provided with a,

controllingvalve '22. It will thus be seen. that live or exhaust steam can be introduced. into' either thein'nerand outers'team-ja'cket. or into bothof such steam-jackets; I

'Ilie chamber; .9" communicates by. means "of a conduit 23 with the'uppe'r end of the outer steamjacket 18 and is provided with a controlling valve 24 and also if desired with a one-way valve 25.

10 is provided with an outlet 28 which leads to the chamber 29 of pressing mechanism 30. The shaft 3 which is journalled in suitable bearings 31 has its forward end extending into-the outlet 28' and adapted to be connected with apressure screw or worm 32 which extends into the removable sleeve 33 of the pressing mechanism and at its forward end it converges as at 34, in order to be in close proximity toithe inner wall of the converging end 35 ofthe sleeve 33. fTh-i-s sleeve isprovided with a: desired number of ports 36-. Thep-ress-ure screw 32 is detachably connected with the cross bar 3'7 of the shaft 3 so that when the closure 38 is removed the sleeve 33 and also the pressure screw 32- may be removed if desired. The closure 38 is in threaded engagement with the outer end of the pressing mechanism and has connected to it in any desired mannera closure 39 provided with a pressing cone 40 which extends into the closure 38 thus forming a chamber 41 through which the pressed material is withdrawn. A steam line 42 discharges into the chamber of the pressing mechanism 30 and the oil and fat are withdrawn through the conduit 43.

Referring now more particularly to Figure l I have shown in this figure a pressing'mechanism in wnich the pressing screw as is straight and the 7 sleeve 4'7 corresponding to the sleeve 33 alsohas a straight bore, it being apparent that otherwise the operation wouldbe the same as that of the construction shown in Figure 1.

In the operation, the chamber 9 is charged with the material to be rendered through the filling opening 11 and the motor 1 is started. The reversing-mechanism 2 is actuated to cause the material to feed toward the left hand end of the rendering tank so that the shaft '7 and the shaft 3 are revoluble in a counter-clockwise direction. The-valve 20 is opened admitting'steam to the inner steam-jacket 1'7 and if desired the valve 22 i s opened so that steam will also be admitted through the branch conduit 21 into the outer steamsjacket 18.

Assuming now' that the motor is in operation,

driving the parts in a counter-clockwise directi'ontne material which. is being subjected to the actlonof. the steam is also being stirred and agitated by the paddles 15.; The steam andvapor in the rendering tank caused by the heating of thematerial escapes through thevalve controlled conduit 23 into the outer steam-jacket 18 and the steam from the inner steam-jacket 17 is vented by a conduit 26 to the outer steam-jacket 18 from which latter it is withdrawn through the suction.

pipe '2i7. As soonas the proper rendering action, due to the heat, has been effectedthe reversing mechanism 2 is actuatedto cause'the moving parts to revolve in a clockwise direction where-.

upon the material being rendered in the chamberl't) is fed to the outlet 28 where it is moved forwardly by the compressor screw 32 andis' compressed. in the sleeve 33, the oils and fats being extracted and passing through "the ports '36.

The cone 40 at its innerend is 's'l'ightly smafller than the diameter "or; "the outlet of the worm ing mechanism. It is provided with a helically inte'rrupted'blade so that while the pressing operation will he progressive it will be intermittent.

The outlet of the rendering chamber 9 is below the bottom of the'tank so that material will feed downwardly by gravity to tlie outlet and if itis not desired to compressthe material it will be apparent that this outlet will serve'as an auto-- matic unloader either with or without the pressure screw 32. The sleeve 33 if employed is preferably perforated throughout its length in order that the oil may pass'therethrough.

The conduit 23 leading from the chamber of the rendering tank 9 is preferably provided with a valve controlled branch conduit 49 which, if desired, may be connected to a vacuum pump or other suction device to withdraw the vapors fromthe rendering tank.

- It will now be apparent that I have devised a new and useful rendering machine which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present instance, shown and described preferred embodiments thereof which will give in practice satisfactory and reliable results, it is to be understood that these embodiments are susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention what I claimas new and desire to secure byLetters' Patent, isz

1. In a rendering machine, a rendering tank having an inner steam-jacket surrounding its outer periphery, an outer steam-jacket surrounding the inner steam-jacket, a valve controlled conduit communicating with said tank and outer steam-jacket, a controllable steam inlet to one of said steam-jackets, and a suction pump outlet from one of said steam-jackets.

' 2. In a rendering machine, a rendering tank having an inner steam-jacket surrounding its outer periphery, an outer steam-jacket surround- 1 ing the inner steam-jacket, a valve controlled conduit communicating with said tank and outer steam-iacket, a controllable steam inlet to one of said steam-jackets, a suction pump outlet from one of said steam-jackets, and means to agitate I.

the material in said tanlc 3. Ina rendering machine, a steam-heated rendering tank having a rendering chamber, a double stain-jacket surrounding said chamber, a

valve eon-trolled.commun-ication with each of said to a, vacuum pump.

. CHRISTOPHER OFFENHAUSER, 

